The formation of mosaics during the reactive growth of MgO films on Ag(100)

Wollschläger, J.; Erdös, D.; Schröder, Klaus

doi:10.1016/s0039-6028(97)00988-6

Cited by 72 publications

(45 citation statements)

References 13 publications

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“…Magnesium oxide (MgO) thin films grown on Mo(001) [10] and Ag(001) [11] have been the subject of active research over the past 20 years. In particular, the film-thickness dependent properties of these films have recently come under scrutiny.…”

Section: Introductionmentioning

confidence: 99%

The role of exposed silver in CO oxidation over MgO(0 0 1)/Ag(0 0 1) thin films

et al. 2015

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The reactivity of MgO(001) films deposited on Ag(001) and Mo(001) in CO oxidation as a function of oxide film thickness was investigated experimentally at ambient pressure reaction conditions. MgO films grown on Mo(001) were found to be inactive in CO oxidation, whereas activity enhancement with decreasing oxide film thickness was observed for MgO(001)/Ag(001). In-situ infrared and post-reaction X-ray photoemission data showed that ultra-thin MgO films interact much more strongly with the reactants and residual water than bulk-like MgO. Poisoning of the MgO surfaces by the resultant accumulation of carbonate and hydroxyl species is suggested to inhibit the reactivity in CO oxidation. Detailed investigations of the surface structure of MgO(001)/Ag(001) films indicate that silver adislands on Ag(001), which are formed during MgO growth, are responsible for the enhancement of CO oxidation activity over ultrathin MgO(001)/Ag(001) films.

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Section: Introductionmentioning

confidence: 99%

The role of exposed silver in CO oxidation over MgO(0 0 1)/Ag(0 0 1) thin films

et al. 2015

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“…2.3.2). In terms of lattice mismatch, Ag(001) is a more suitable substrate than Mo(001) and first studies of the growth mode have been reported by Wollschläger et al [51]. First scanning tunneling microscopy (STM) data from surfaces of ultrathin MgO(001)/Ag(001) thin films were reported by Schintke et al, which demonstrated that large MgO(001) islands with a low density of defects grow on the Ag(001) surface [52].…”

Section: Mgo Model Surfacesmentioning

confidence: 99%

Atomic Scale Characterization of Defects on Oxide Surfaces

Nilius

Sterrer

Heyde

et al. 2015

Springer Series in Surface Sciences

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The physics and chemistry of oxide surfaces cannot be recognized without taking into account the variety of lattice defects. Defects largely govern the electronic and optical properties of oxides, they offer potential binding sites for atoms and molecules, and serve as charge centers that control the donor or acceptor character of the material. In this contribution, we demonstrate how the nature of surface defects on oxides can be probed in an ensemble but also on the level of individual defects, focusing on defects on the surface of thin, single-crystalline oxide films of MgO and CeO₂ as prototype examples for non-reducible and reducible oxides, respectively. Scanning probe techniques play a fundamental role in this respect, as they enable direct visualization of surface defects and provide insight into the electronic structure of defects and local potential modulations in their vicinity

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“…Deposition at 300 K yielded dioxygen or partially reduced species of magnesium oxide films, whereas annealing of the oxidized films to 800 K causes the conversion of the di-oxygen or partially reduced species to the oxide state. Wollschlä ger et al [29] have shown that mosaic like structures are formed during the growth of MgO films on Ag h1 0 0i at 350 K. The mosaic angle has been obtained by analyzing the profiles of the specular spot for various scattering conditions. MgO satellites appearing in the diffraction pattern were attributed to mosaics with h1 0 0i planes tilted in the h0 1 0i directions.…”

Section: Ultra High Vacuum Technique (Uhv)mentioning

confidence: 99%